Optical tool setting method and device for ultra-precision lathe

The invention provides an optical tool setting method and device for an ultra-precision lathe, and belongs to the technical field of machine tool workpiece feeding motion control, and the method comprises the steps: making a suspension mark for a tool center imaging position of a first tool on a display screen of a camera when the first tool on a tool rest of the ultra-precision lathe needs to be replaced with a second tool; replacing the first cutter with a second cutter; and the cutter center imaging position of the second cutter on the display screen is controlled to coincide with the suspension mark, so that cutter setting of the second cutter is achieved. When the ultra-precision lathe has the tool changing requirement, the tool setting of the new tool is realized by controlling the imaging position of the tool center of the new tool on the display screen of the camera to coincide with the imaging position of the tool center of the old tool under the condition that the tool setting is completed, the tool